feat: initial commit — local services (backend + manager dashboard + waiter PWA)

Includes all work to date:
- local_backend: FastAPI backend with products, orders, tables, shifts, cloud sync
- manager_dashboard: React manager UI with product/category management, reports, settings
- waiter_pwa: React PWA for waiter devices
- Category reparent endpoint and UI
- Waiter domain: local_ip sent on heartbeat, waiter_domain persisted from cloud response
- QR code modal in AppInfoTab for waiter domain
- Product form: number input spinners removed, category pre-selected on new product
- Category row: count badge moved to far right

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

local_backend/schemas/message.py

@@ -0,0 +1,42 @@
+from pydantic import BaseModel
+from typing import Optional, List
+from datetime import datetime
+
+
+class QuickTemplateCreate(BaseModel):
+    body: str
+    sort_order: Optional[int] = 0
+
+
+class QuickTemplateUpdate(BaseModel):
+    body: Optional[str] = None
+    sort_order: Optional[int] = None
+    is_active: Optional[bool] = None
+
+
+class QuickTemplateOut(BaseModel):
+    id: int
+    body: str
+    sort_order: int
+    is_active: bool
+
+    model_config = {"from_attributes": True}
+
+
+class SendMessageRequest(BaseModel):
+    body: str
+    target_waiter_ids: List[int]  # empty = all active waiters
+    table_ids: Optional[List[int]] = []
+
+
+class StaffMessageOut(BaseModel):
+    id: int
+    sender_id: int
+    sender_name: Optional[str] = None
+    body: str
+    target_waiter_ids: str   # raw JSON string — frontend parses
+    table_ids: str
+    created_at: datetime
+    acked_by: List[int] = []  # waiter ids who have acked
+
+    model_config = {"from_attributes": True}